Chapter 14, Problem 53QAP

Interpretation Introduction

Interpretation:

The volume of 73% lactic acid required to add to sodium lactate to produce a buffer of pH 4.50 needs to be determined.

Concept introduction:

The pH of buffer solution can be calculated using the Henderson-Hasselbalch equation as follows:

$\text{pH}=p{K}_a-\log \frac{\left[{\text{A}}^{-}\right]}{\left[\text{HA}\right]}$

Here, $\left[{\text{A}}^{-}\right]$ is conjugate base and $\left[\text{HA}\right]$ is acid.

The mass percent of any component in the solution is represented as follows:

$\%m_{\text{A}}=\frac{m_{\text{A}}}{m_{\text{solution}}}\times 100\%$

Here, $m_{\text{A}}$ is mass of component A and $m_{\text{solution}}$ is mass of solution.

The density of solution is calculated as follows:

$d=\frac{m}{V}$

Here, m is mass and V is volume of the solution.